Cake:
1/2 cup unsalted butter (1 stick), cut into pieces
1/2 cup water
1 cup all-purpose flour (I use unbleached)
1/2 cup white whole-wheat flour (found in 5-lb bags with all the other flours at most supermarkets; this whole-grain flour is lighter in color and softer in texture than traditional whole-wheat flour)
1/2 cup coconut flour*
1 teaspoon baking powder
1/4 teaspoon baking soda
1/4 teaspoon salt
1 1/2 cups white sugar
2 eggs, beaten
1/2 cup reduced-fat sour cream (NOT fat-free)
1/2 cup unsweetened applesauce
1 teaspoon coconut extract (plus a few extra drops if you really like coconut)
Icing:
1 cup white sugar
2 TB butter
6 tablespoons (1/4 cup plus 2 tablespoons) milk, plus additional as needed
2 cups confectioner's (powdered) sugar
1 teaspoon coconut extract (plus a few extra drops if you really like coconut)
Sweetened flaked coconut for garnishing (approximately 1 cup)
What to Do:
1. Round up a sheet pan approximately 9" by 13" in size. You can fudge a little on these measurements...7x11 or 10x15, for example. But don't try to cram this quantity of batter into a 9-inch square or stretch it across a half-sheet pan. Butter the pan or spray it with nonstick cooking spay.
2. Preheat your oven to 375 degrees F and make sure your rack is in the middle position.
3. In a small bowl, stir together the all-purpose flour, white whole-wheat flour, coconut flour, baking powder, baking soda, and salt. Set aside.
4. In a large saucepan, bring the 1/2 cup (1 stick) of butter and the water just to a boil, stirring once or twice while waiting for this to happen.
5. As soon as the butter/water mixture boils, pull the pan off the heat. Dump the flour mixture into the pan, followed by all the remaining cake ingredients in the order listed. Stir everything together with a wooden spoon just until everyone is in the party and you don't see any rebellious pockets of dry flour mixture.
6. Pour the cake batter into the prepared pan, smooth the top, and bake for 15-20 minutes or until a toothpick inserted into the center of the cake emerges with moist crumbs clinging to it. Be careful not to overbake this cake. You want the aforementioned moist crumbs--not wet batter, but not a totally clean pick, either. A minute can make a difference here, so start checking early and keep checking often. As my mom always said, you can add cooking time, but you can't take it away.
7. While your cake is baking, making the icing by melting the 1 cup white sugar, the 2 tablespoons of butter, and the milk in a medium-sized saucepan over medium heat. Bring the mixture to a boil, stirring constantly, then reduce the heat to medium-low and cook (keep stirring!) until the sugar is dissolved. Remove from heat and let cool for 2-5 minutes while the cake finishes baking. If the icing base mixture starts to set before your cake comes out of the oven, put it back over medium heat and resume your stirring just long enough to liquefy it again.
8. When your cake is done, remove it from the oven, poke the entire surface with a fork, and set it on top of the stove or on a wire rack while you finish off your icing: add the confectioner's sugar and the coconut extract (your second installment of this ingredient in this cake) to the cooked sugar mixture and beat with a wooden spoon until smooth and/or you have worked out all your aggression, whichever comes first. If the icing looks too thick to pour easily, add a little more milk, a few drops at a time, until you have a manageable but not runny consistency.
9. Immediately pour the warm icing over your fork-poked cake and spread it evenly from edge to edge. Without delay, sprinkle the entire surface generously with flaked coconut.
10. Enjoy warm or at room temperature. If you have any to store, be sure to cover your pan tightly with plastic wrap or foil so it doesn't dry out. Eating the entire cake the day it's made also solves this problem nicely.
*This is really the only unusual ingredient in this recipe. Coconut flour is gluten-free, which helps make this cake especially tender. It also augments the coconut flavor we are seeking here. Yes, it is expensive (I bought a pound at Big Lots for about $7...you can find it for slightly more at any health food store). But if you store it, well-wrapped, in the freezer, it will last a long time. Swap it in for part of the flour in your favorite pancake recipe, top it with pineapple, and you'll be off to Hawaii without needing a plane ticket or a bathing suit. I highly recommend making the effort to get some and use it in this cake, but if necessary, you could substitute in 1/2 cup cake flour or additional all-purpose flour or white whole-wheat flour. Your finished cake just won't be quite as tender.
~Baker Beware~ This recipe worked using the ingredients and method listed above. You are of course free to make your own substitutions at will--coconut oil for the butter, self-rising flour for the all-purpose, ground flaxseed for the eggs, agave nectar for the sugar, etc. But if you make these substitutions, you will have made a different cake than the one described above. Who knows...it will probably be fabulous! If it is, let me know so I can try it!